189139540 has 12 divisors (see below), whose sum is σ = 397193076. Its totient is φ = 75655808.

The previous prime is 189139529. The next prime is 189139543. The reversal of 189139540 is 45931981.

It can be written as a sum of positive squares in 2 ways, for example, as 33039504 + 156100036 = 5748^2 + 12494^2 .

It is a junction number, because it is equal to n+sod(n) for n = 189139493 and 189139502.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (189139543) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4728469 + ... + 4728508.

It is an arithmetic number, because the mean of its divisors is an integer number (33099423).

Almost surely, 2^189139540 is an apocalyptic number.

189139540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

189139540 is an abundant number, since it is smaller than the sum of its proper divisors (208053536).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

189139540 is a wasteful number, since it uses less digits than its factorization.

189139540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9456986 (or 9456984 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 40.

The square root of 189139540 is about 13752.8011692164. The cubic root of 189139540 is about 574.0205531132.

The spelling of 189139540 in words is "one hundred eighty-nine million, one hundred thirty-nine thousand, five hundred forty".